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Share capital - Authorized unlimited common shares, no par value (Details) - USD ($)
$ / shares in Units, $ in Thousands
 3 Months Ended 12 Months Ended
Nov. 07, 2025
Feb. 28, 2026
Feb. 28, 2025
Nov. 30, 2025
Share capital        
Unlimited common shares authorized   Unlimited   Unlimited
Common Stock, No Par Value   $ 0   $ 0
At-the-market offering, net of share issue costs, Number of shares   174,410    
At-the-market offering, net of share issue costs, Ascribed value   $ 1,164    
Exercise of options, Number of shares   153,334 263,333  
Exercise of options, Ascribed value   $ 166 $ 131  
Equity distribution program, aggregate offering amount $ 200,000      
Gross proceeds   $ 1,190    
Average price per share   $ 6.83    
Net proceeds   $ 1,164    
Share capital        
Share capital        
Beginning balance, Number of shares   171,069,888    
Beginning balance, Ascribed value   $ 225,241    
At-the-market offering, net of share issue costs, Number of shares   174,410    
At-the-market offering, net of share issue costs, Ascribed value   $ 1,164    
Exercise of options, Number of shares   153,334 263,333  
Exercise of options, Ascribed value   $ 246 $ 195  
Shares issued from Restricted Share Units, Number of shares   1,148,007 2,647,945  
Shares issued from Restricted Share Units, Ascribed value   $ 1,167    
Ending balance, Number of shares outstanding   172,545,639   171,069,888
Ending balance, Ascribed value   $ 227,818   $ 225,241